-- I Am Number Four: On the run from his enemies, a teen changes his identity and develops supernatural powers. Alex Pettyfer, his real-life girlfriend Dianna Agron and Timothy Olyphant star. Rated PG-13.

-- Unknown: Liam Neeson plays a man whose identity is stolen from him after he's involved in a car accident in Berlin. January Jones, Aidan Quinn and Diane Kruger also star. Rated PG-13.

-- Big Mommas: Like Father, Like Son: In the third film in the Big Momma series, Martin Lawrence reprises his role as an FBI agent who goes undercover as "Big Momma." This time, Lawrence's character teams with his teenage stepson, who poses as a female at an all-girls performing arts school in order to track down a murderer. Brandon T. Jackson also stars. Rated PG-13.﻿